Lock.



E. L. WILLIAMS. Loox.

APPLICATION I'ILD JAILZO, 1913. 1,093,817I Patented Apr. 21, 1914.

iwlwwml STATES PATENT OFFICE.

nvwum L. WILLIAMS, or SANTA ciauz, cALiFonNIA, AssrGNon or omi-HALF To nos A. wycxorr, .orsan'ra ciauz, CALIFORNIA.

Locicfl` seaiaeonoframsrafn. Patented Apnai, 1914.

. Application ma January 20, 1913. serial up. 742,987.

To all whom it may concern Be lit known that I, EDWARD L. WILLIAMS, a citizen of the United States, 4residin at Santa Cruz, in the county oii Santaruz and State of California, .have invented `certain new and useful Improvements in Locks,v of which the following is a speciica'tion.

This inventionrelates in general to locks and more particularly to locks adapted to receive ake at one end only, such locks being designe to permit the insertion and removal of a key only when tlie lock is in locked position and to prevent removal of the keywhen the lock is unlocked, such locks being adapted for use on `cash boxes, lockers, and the like.

v Owing to imperfections in the construction of a lock or inaccuracies in its operation, it sometimes happens that the lock will be .unlocked by the removal of the key, particu larly iftlie key sticks-'and is wiggled or moved about in an endeavor to withdraw it.-

The result is that the key is withdrawn while the lock is unlocked instead of being locked as it is intended -to be and should be.

My presentinvention is designed to positively lock the lock in locked position and initiate the removal of thc key so that it will be impossible to unlock the lock when the key is Withdrawn.

One preferred embodiment of my invention is illustrated in 4the accompanying drawings and described in the following specification, while the scopeof theinven tion is setforth in the appended claim.

Referring to the drawings-Figure 1 ,is a side view of a lock embodying my invention; Fig. 2 is ay view 'looking toward the left in Fig.- l; Fig. 3l is a plan view; Fig-'4 is a longitudinal sectional view of the lock;

and Fig. 5 is a view taken substantially on the line 5-5 of Fig. 4. 1 Y.

The lock as shown 'in the drawings .coniprises a housing or casing 6 substantially' cylindricalin cross-section adapted to beset inthe movable wall 7 of a\box, locker', or

the like, with its front face Hush" with the outer face of thewall in which it is setto receive the key `8 in the usual manner. A

cylinder 9 is rotatably mounted in the casing and carries on its top a lug or projection 10 secured thereon by screw s` 11 or other preferred fastening means, said lug being adapted to engage behind a lip or stop 12 of the stationary wall 13 to lock the wall 7 thereto. The wall 13 is provided with a slot to permit the -entrance and withdrawal of the locking lug l0 when the cylinder 9 is turned to unlocked position as shown by dotted lines in Fig. 2, the locked position of the lug being shown in full lines in Fig. 2. The casing is provided with' a slot 14 hich permits limited rotation of the cylin er to dispose the lug 1.0 in locked and unlocked positions.

- An extension 15 on the bottom of the casing is provided with a plurality of sockets 16 adapted to -contain the plungers 17normally urged upwardly toward the cylinder by expansion springs 18. The cylinder is bored to receive tumblers 19 which lare forced down into the position shown in Fig. 4 upon the insertion of the key 8, thereby depressing the plungers 17 to a position outside the periphery of the cylinder so that :the cylinder can be turned to unlock the lock. The'mechanism thus far described is of well known construction and is shown merely for purposes of/illiistration Asince it will be obvious that my invention, lwhen better understood, is applicable to locks of other types as well as to the type above described.

.Locks of this general character are designed to permit withdrawal of the key only when the lock is in locked position and to prevent Withdrawal of the key when the lock is in unlocked position, but, owing to imperfections in construction and inaccuracies in operation, it sometimes happens,

-1 particularly if the key sticks in the lock,

that the lock will be unlocked in the operation of withdrawing the key with'the result that the desired protection is lost. I have, therefore, designed a structure for positively locking. the cylinder 9 against .rotation in the casing whenever the lock is turned to locked position so that all danger of releas- .ing the lock upon Withdrawal of the key is f'obviated. This locking device consists of 4"la latch 20 pivotally mounted at 21 upon the casing 6 `and provided with a downwardly extending tail 22 adapted to be normally urged outwardly by an Aexpansion spring 23 located in the housing, as .shown .in Fig. 2. The latch is provided adjacent its upper end with a tooth or dog 24 to engage in a notch 2 5 in the rear end of the casin 6 and between .this end and the pivot 21 with another tooth or dog 26 adapted to en age in a notch or groove in the rear end o the leased and this can only be effected by the cylinder 9. Whenever the" lock is turned to locked position the spring 23 will swing the latch a out'its pivot to engage both -of the teeth with their respective notches, thereby securely locking the cylinder .against rotation in the casing. When the cylinder is thus locked it is impossible to turn it to unlock the lock until the latcli has been recomplete insertion of the key so that its inner end engages the latch and moves it outwardly into the position shown in full lines in Fig. 2 and in dotted lines in Fig. 1. When the lock is locked the key will be forced outwardly by the spring-pressed latch into the position shown in fulllines in Fig.

' 1, so that the cylinder will be immediately -locked by the latch against rotation. Any manipulation' of the ey by twisting t'or wigg ing vit about in the key-hole to withydraw the same can not possibl release the latch which will positively ho d the cylinder against rotation until the key has been again inserted its full le th to move the latch into inoperative positlon.

, It is believed that my invention' will be understood from the foregoing without further description and it will be manifest that I have provided a means for positively insuring against the accidental unlockin of a lock of the general character disclose but,- while I have showny in the drawings and described in the` preceding description that practical embodiment of my invention which at the present time seems preferable, neverz:

theless, I desire it to be understood that my invention is not limitedin its application to the particular construction 'shown and described but is capable of embodiment in various -forms within the purview of the followin claim.'

claim: l

A lock comprising a casing, a key cylinder rotatably mounted therein and provided with a longitudinally disposed key slot,` a notch formed on the inner end of said cylinder at one edge of said key slot, a notch formed in said casin at the inner end of said cylinder and iametrically op cs lte from said notch in the cylinder, a latc plvotally mounted in the casingmat one side of said cylinder and adapted to overlie the end of said cylinder, dogs carried b said latch in position to engage in said notc es whereby v to lock the cylinder against rotation in the casing,.and a spring housed in said casing and adapted to urge said latch into` operative position, the latch being disposed across the end of the key slot when the cylinder is in locked position, to be engaged and released by a key projected through said slot.

l EDWARD L. WILLIAMS.

,.Witnesses: 4 v y THnRoN W. HINDS, C. B. TAYLOR. 

